Fortunately, a simple way is to do this with the beautiful command-line utility FFmpeg. A much better solution is to perform “lossless” trimming. You can split and trim files in most graphical video editing software, but these will typically recompress the export file, reducing the video quality. Cropping a video means cutting out parts of the image, and I have another blog post on cropping video files using FFmpeg. Splitting and trimming are temporal transformations and should not be confused with the spatial transformation cropping. I often have long video recordings that I want to split or trim. This is a note to self, and hopefully others, about how to easily and quickly trim videos without recompressing the file.
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